Exodus 19:2

ויסעו מרפידים AND THEY JOURNEYED FROM REPHIDIM — What does Scripture teach us by again expressly stating from where they set forth on the journey, for is it not already written (Exodus 17:1) that they had encamped at Rephidim and it is therefore evident that they set forth from there?! But Scripture repeats it in order to make a comparison with the character of their journey from Rephidim to that of their arrival in the wilderness of Sinai! How was it in the case of their arrival in the wilderness of Sinai? They were in a state of penitence (as shown by the unanimity with which they encamped before the mountain: cf. Rashi on the end of this verse)! Thus, too, their setting forth from Rephidim was in a state of repentance for the sin they had committed there (see Exodus 17:2) (Mekhilta). ויחן שם ישראל AND THERE ISRAEL ENCAMPED as one man and with one mind — but all their other encampments were made in a murmuring spirit and in a spirit of dissension (Mekhilta). נגד ההר BEFORE THE MOUNTAIN — i. e. at its east side (Mekhilta), for wherever you find the word נגד referring to a locality it signifies with the face towards the east of the place mentioned.

וַיִּסְע֣וּ מֵרְפִידִ֗ים וַיָּבֹ֙אוּ֙ מִדְבַּ֣ר סִינַ֔י וַֽיַּחֲנ֖וּ בַּמִּדְבָּ֑ר וַיִּֽחַן־שָׁ֥ם יִשְׂרָאֵ֖ל נֶ֥גֶד הָהָֽר׃

For they were departed from Refidim, and were come to the desert of Sinay, and had pitched in the wilderness; and there Yisra᾽el camped before the mountain.